All the HiFiman models you have mentioned in all your questions are less than that needed to trigger the high impedance mode. There is an app called LG DAC Fix (free) that might solve this problem. It doesn’t work with every device. An easier way is to get this FosPower adapter http://amzn.to/2uMyEpf , connect it to your headphones . What you do is plug the adapter in first, this trigger AUX mode. Then plug the headphones into the adapter.